Registrations are again open, as it appears all spam bots posted from the same IP ranges,.
So, from their IP addresses, I got the two AS they use, and from bgp.he.net, I get the associated known IP ranges (the route they accounce in various BGP sessions).
Nginx is configured not to send a reply when a request origin is one of those IP addresses.
We'll see if that works in the next 72 hours.
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